Abstract: The wear curve of work roll is obtained by measuring CVC work roll wear condition in CSP line at steel works. On this basis with considering main factors to influence roll wear, the work roll wear model suited to CSP line is established and the key parameters of model are defined by MATLAB software overall situation optimized calculating-method. Calculated results by the model show that relative error between regression wear curve area and real wear curve area is 3. 78%, the correlation coefficient between measured value and calculated value is 0. 932 8, so the model is available to predict the roll wear online.